Audio Speed & Pitch Changer

This free audio speed and pitch changer lets you slow down or speed up audio from a quarter speed to 4× — with one-click presets, an exact numeric entry, and speed shown as both a multiplier and a percentage. By default the pitch is preserved as you change speed, so slowed-down music still sounds in tune; shift the pitch separately in semitones, link the two for an old record/tape effect, or reverse the whole track. Great for music practice, transcription, backing tracks and voice effects.